Oscillating hook for sewing-machines



(No Model.)

P. DIBHL. OSGILLATING HOOK FOR SEWING MACHINES. 'No. 523,333 PatentedJuly 24, 1894.

WITNESSES: INVENTORe v PHILIP DIEHL, OF ELIZABETH, NEW JERSEY, ASSIGNORTHE SINGER MANUFACTURING COMPANY OF NEW JERSEY.

' with a guard to hold the bobbin=thread out of UNITED STATES Tries,

PATENT OSCILLATING HOOK FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 523,333, dated July24,1894. Application filed November 20, 1893. Serial No. 491,452. (Nomodel.)

To all whom it may concern:

Be it known that I, PHILIP DIEHL, a citizen of the United States,residing 'at Elizabeth, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Oscillating Hooksfor Sewing- Machines, of which the following is a specification,reference being had therein to the accompanying drawings.

My invention relates to that class of lockstitch sewing machines inwhich the lower or looking thread is supplied from a bobbin conno threadwill be drawn down through the eye of the said needle while the latteris moving upward through the Work, thus adapting the hook for use inmachines for sewing leather and other firm or comparatively hardmaterial and having regular needle-bar movements; to provide anoscillating hook which will positively hold and control the loops ofneedle thread until they are so well shortened, in being drawn up, thatthey cannot twist and kink; and also to provide an oscillating hook theway of the beak of the hook and with a needle guard, so that while theneedle may be so set as to travel close to the path of the point or beakof the hook there will be no danger of breaking the said needle.

In carrying my invention into effect the body of the oscillating hook isprovided with a long beak-shank which first increases and thendiminishesin cross-section from the point or beak rearwardly, beingpreferably largest at or near its middle portion, so that when theneedle has descended and a loop of needle thread has been caught bysaidpoint or beak said loop will be immediately so enlarged by theforwardly-moving beak-shank, before the eye of the regularly-operated,upwardly-moving needle reaches the under side of the work, that whilethe eye of said needle is moving upward through the work the slackrendered or given up by the forwardly-moving, rearwardlydiminishing partof the beak-shank will not only render any further downward drawing ofthe needle thread unnecessary but, on the contrary, will furnishsufficient slack to permit the needle to lift the thread slightly sothat the eye of the needle need not travel upward on the thread; andthus the objection (most serious in sewing leather and other firm orcomparatively hard material) arising from drawing down thread when theneedle is moving upward through the work, is avoided.

To prevent kinking of the needle thread by the escape of large loopsthereof from the mouth of the hook, and to positively hold and controlsaid loops until they are so well shortened that they will not twist andkink, I provide the hook with a broad tail-piece which extends laterallyon both sides of the beak of the hook, and which tail-piece is inside ofor beneath said beak so that it is overlapped, radially, by the latter,thereby so contracting and guarding the opening or mouth between theheel and be'ak of the hook that alarge loop cannot escape or flop out ofsaid mouth but will be positively controlled and held by the retreatingbeak shank and beak until it is nearly drawn up to the under side of thethroat-plate. The broad tail-piece referred to, and which on theforward. or loop-seizing movement of the hook is moving in front of saidbeak, has a needle slot at one side of which is a radially projectingflange, the front or vertical face of which latter is in line withthesaidbeak,said face thus servingas aneedle guard in that it travels inclose proximity or even contiguous to the needle while the latter isperforming the latter part of its downward and the early part of itsascending movement to form the loop to be caught by the point or beak ofthe hook; and thus, even if the needle should be so set or bent that itwould otherwise be in danger of being struck and broken by the saidbeak, said needle will be so held by the said needle guard that the beakwill pass it and take its loop without bending or breaking it. The outerface of said broad tail-piece also serves as a guard for thebobbin-thread to hold the latter laterally away from the beak of thehook and prevent said hook from interfering therewith.

In the accompanying drawings Figure l is a plan or side view of myimproved hook and Fig. 2 is a sectional view of the same and of thebobbin cases and bobbin. Figs. 3, 4, 5 and 6 are front end views showingdifferent positions assumed by the needle and hook in the formation of astitch.

A denotes a part of the hook shaft which may be oscillated in anysuitable manner, as, for example, by the mechanism shown by UnitedStates Patent No. 388,324, or by that shown by my pending application,Serial No. 448,144, filed October 7, 1892. To the said shaft is attachedthe hook at having a cavity in which is supported an outer orsupplemental bobbin case I) having a central pin or support I) engaginga central sleeve or support a on an inner bobbin case, or bobbin caseproper, c, which incloses the bobbin (1. The bobbin case 0 is heldstationary by any suitable device as by a latch or finger e.

The hook a. is provided with a loop-seizing point or beak a which iscarried by a long beak shank a which is enlarged rearwardly from thebeak a' preferably to or near its middle portion where it is largest incross section, being preferably swelled or enlarged both inwardly andlaterally, as shown; said beak-shank tapering or diminishing in crosssection rearwardly from its enlarged portion to its neck portion a whereit joins the body of the hook. The said hook body a. is provided at itsheel portion with a broad tailpiece a which extends laterally on bothsides of the beak a of the hook, said tail-piece being beneath or withinsaid beak so as to be overlapped, radially, by the latter. Between saidheel or tail-piece or and said point or beak a is an opening or mouth ainto which the loops of needle thread are entered and out of which theyare drawn by the take-up after having been passed around the bobbincases and the locking thread supplied from the bobbin contained therein;the said tailpiece, extending beneath or being overlapped radially bythe said beak a, serving to contract said opening or mouth and thusguard the same from the too early escape of the loops of needlethread.The said tail-piece is broad enough so that the front face (r of itsrear end is laterally to the left or on the front side of the beak ctand thus serves to hold the bobbin thread laterally out of the way ofthe said beak when the latter is advancing to take a loop ofneedle-thread.

Rearward of the slot a formed between the rearwardly tapering rearportion of the beak shank and the body portion of the hook is thethread-carrying or loop-spreading part a of the hook, the front face ofsaid part serving as a stop for the loops of needle thread into whichthe beak shank has fully entered, as in Fig. 4, so that as the hookmoves forward to the position shown in Fig. 5 the loop in engagementwith said face will be enlarged and carried around beneath the bobbincases in position to be drawn up on the left or rear side of the bobbincases, and thus when the hook is reversed to bring its mouth upward theloop may escape from said mouth and be tightened into the work.

The broad tailpiece a is provided with a needle slot at one side ofwhich is a flange projecting radially from the periphery of saidtail-piece and having a front vertical face a which is in line, orapproximately so, with the point or beak a. of the hook Ct so as toserve as a needle guard to prevent a needle which is bent toward, or setto reciprocate in a line too near the path of said point or beak frombeing damaged or broken by being struck by thelatter; said face orneedle-guard a moving in front of the said point or beak when the latteradvances to take a loop of thread from the needle. The tail-piece a isprovided with a slight lateral projection to form a shoulder a" whichserves, when the hook is in its extreme backward position, to engage thebobbin thread to draw off slack enough for the next succeeding stitch,as in the similar construction described in my pending allowedapplication, Serial No. 455,795, filed December 20, 1892.

Fig. 3 represents the relative positions of the hook and needle as thelatter is descending and is adjacent or contiguous to the needle-guardor face a Fig. 4 represents the relative positions of the hook andneedle when the beak-shank has been fully entered into the loop ofneedle thread and the eye of the needle has risen above the work, andthe hook then advances from the position shown in Fig. 4 to the positionshown in Fig. 5 to carry the loop around beneath the bobbin cases; Fig.5 representing the hook in its extreme forward position and ready tocommence its reverse movement.

In the position shown in Fig. 6 the hookin its reverse or backwardmovement has returned far enough to permit theloop of needle thread tohave been so well shortened or drawn up while still in contact with thebeak shank and beak that when dropped from said beak, as the hookcontinues its backward movement, said loop will be so small that it willnot be liable to twist and kink, and all dificulty from this source oftrouble will be avoided.

It will thus be seen that with my improved hook I avoid the difficultyincidental either to drawing the thread through the eye of the needle orto moving the needle upward on the thread when the needle-eye is in thework; that I am enabled to positively hold and control the loops ofneedle thread until they are so well shortened and drawn up that dangerof kinking of the said loops is'avoided; and that I also provide theoscillating hook with an efficient bobbin-thread guard and needle guard.

Having thus described my invention, I claim and desire to secure byLetters Pat- 1. An oscillating hook for sewing machines provided with aloop-seizing point or beak and with a broad tail-piece which extendslaterally on both sides of the said point or beak, and which is beneathor inside of, and is thus overlapped, radially, by the said point orbeak, said hook having between said beak and tail-piece an opening ormouth into which the loops of needle thread are entered and out of whichthey are withdrawn, and which opening or mouth is guarded by saidtailpiece.

2. -An oscillating hook for sewing machines provided with a loop-seizingpoint or beak and with a broad tail-piece which extends laterally onboth sides of the said point or beak and which is beneath or inside of,and is thus overlapped, radially, by the said point or beak, said hookhaving between said beak and tail-piece an opening or mouthinto whichthe loops of needle thread are entered and out of which they arewithdrawn, and which opening or mouth is guarded by said tailpiece, andsaid tail-piece having a face which is in front, laterally, of the saidpoint or beak so as to serve as a guard for the bobbin thread to holdthe latter aside when the said point or beak is advancing to take a loopof needle thread, and said tail piece having also a needle slot at oneside of which is a radially projecting flange one face of which is inline, or approximately so, with said point or beak, to serve as a needleguard.

3. An oscillating hook for sewing machines provided with a loop-seizingpoint or beak and with a broad heel portion or tail-piece having aneedle slot atone side of which latter is a flange projecting radiallyfrom said tail-piece and one face of which flange is in line, orapproximately so, with the said point or beak, to serve as aneedle-guard, said hook having between said point or beak and saidtail-piece an. opening or mouth into which the loops of needle threadare entered and out of which they are withdrawn.

4. An oscillating hook for sewing machines provided with a loop seizingpoint or beak and with a long beak shank which is swelled or enlargedand then diminished in cross-section from said point or beak rearwardly,said hook being also provided with a broad heel portion or tail-piecewhich extends laterally on both sides of the said point or beak andwhich is beneath or inside of the said point or beak, so as to beoverlapped, radially, the latter.

5. An oscillating hook for sewing machines provided with a loop-seizingpoint or beak and with a long beak-shank which is swelled or enlargedand then diminished in cross-section from said point or beak,rearwardly, said hook being also provided with a broad heel portion ortail-piece which extends laterally on both sides of the said point orbeak and which is beneath or inside of the said point orbeak, so as tobe overlapped, radially, by the latter, and the said tail-piece having aneedle slot at one side of which is a flange projecting radially fromsaid tail-piece and one face of which flange is in line, orapproximately so, with the said point or beak, to serve as aneedle-guard.

-6. An oscillating hook for sewing machines provided witha loop seizingpoint or beak a and with a long beak shank a which is swelled orenlarged and then diminished in cross-section from said point or beakrearwardly, said hook having a loop-spreading part a inside,

radially, of the said beak shank and between which loop-spreading part aand the said shank is a slot a the said hook having also a broadtail-piece a which extends, laterally, on both sides of the said pointor beak and which is beneath or inside of said point or beak so as to beoverlapped, radially, by the latter.

7 An oscillating hook for sewing machines provided with a loop seizingpoint or beak a and with a long beak shank a which is swelled orenlarged and then diminished in cross-section from said point or beakrearwardly, said hook having a loop-spreading part a inside, radially,of the said beak shank and between which loop-spreading part a and thesaid shank is a slot (1 the said hook having also a broad. tail-piece awhich extends, laterally, on both sides of the said point or beak andwhich is beneath or inside of said point or beak so as to be overlapped,radially, by the latter, and the said tail-piece having a needle slot atone side of which isa flange projecting radially from said tail-pieceand the outer face a of which flange is in line, or approximately so,with the said point or beak, to serve as a needle-guard.

8, An oscillating hook for sewing machines provided with -a loop seizingpoint or beak a and with a long beak shank a which is swelled orenlarged and then diminished in cross-section from said point or beakrearwardly, said hook having a loop-spreading part a inside, radially,of the saidv beak shank and between which loop-spreading part a and thesaid shank is a slot'aLthe said hook having also a broad tail-piece awhich extends, laterally, on both sides of the said point or beak andwhich is beneath or inside of said point or beak so as to be overlapped,radially, by the IIO latter, and the said tail-piece havinga needlewitha shoulder a, to serve as a pull-off for slot at one side of which is aflange projectthe bobbin thread. :0 ing radially from said tail-pieceand the outer In testimony whereof I afiix my signature in face a ofwhich flange is in line, or approxipresence of two witnesses.

5 mately so, with the said point or beak, to serve PHILIP DIEIIL.

as a needle-guard, the said tail-piece having Witnesses: also a face awhich is laterally in front of J. G. GREENE,

the said point or beak and which is provided HENRY CALVER.

